NOAA issued a G3, or “strong” geomagnetic storm watch, for Saturday and Sunday ahead of the flare slamming into the Earth. The scale
for geomagnetic storms runs from G1, or minor storm, to G5, an extreme storm.
This geomagnetic storm could cause voltage irregularities and false alarms on some protection devices, NOAA warns. It also could cause high frequency radio blackouts and loss of radio contact on the sunlit side of the earth.